Leonardo AI vs StepFun Step 3.5 Flash
Which one should you pick? Here's the full breakdown.
Leonardo AI
Versatile AI image generator with fine-tuned models and a generous free tier
StepFun Step 3.5 Flash
StepFun's (China) agent-focused open-weight model -- Step 3.5 Flash launched 2026-02-01. 196B sparse MoE, ~11B active. Benchmarks slightly ahead of DeepSeek V3.2 at over 3x smaller total size. Step 3 (321B / 38B active, Apache 2.0) and Step3-VL-10B multimodal also in the family
| Category | Leonardo AI | StepFun Step 3.5 Flash |
|---|---|---|
| Ease of Use | 8.0 | 6.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.0 | 9.0 |
| Features | 8.0 | 8.0 |
| Overall | 8.3 | 7.8 |
Pricing Comparison
| Feature | Leonardo AI | StepFun Step 3.5 Flash |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Which Should You Pick?
Pick Leonardo AI if...
- ✓Easier to use (8 vs 6)
Anyone who wants a capable image generator without paying upfront. The free tier is real, not a 3-image trial. Great for game devs and content creators who need specific styles.
Visit Leonardo AIPick StepFun Step 3.5 Flash if...
Teams building agent systems on Chinese open-weight foundations who want something other than DeepSeek or Qwen, especially if agentic tool-use is the primary workload. Also good for Chinese-market products where StepFun's domestic tuning advantages matter. And for anyone looking to add diversity to their open-weight evaluation matrix beyond the top-3 Chinese labs.
Visit StepFun Step 3.5 FlashOur Verdict
Leonardo AI edges out StepFun Step 3.5 Flash with a 8.3 vs 7.8 overall score. Both are solid picks, but Leonardo AI has the advantage in features.